Garmin STC for Bell 206/407 User manual

Brand: Garmin

Model: STC for Bell 206/407

Type: User manual

G500H Flight Display System

Instructions for Continued Airworthiness

Bell 407

Reg. No.____________ S/N_______________

STC SR02295LA

Dwg. Number:

190-01150-21 Rev. 2

Garmin International, Inc.

1200 E. 151st Street

Olathe, Kansas 66062 USA

Record of Revision

Rev. Date Description of Change

1 04/05/10 Initial Release

2 12/8/10 Added VSI Placard

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 2 of 19

 INTRODUCTION ................................................................................................................... 3

1.1 Purpose ................................................................................................................. 3

1.2 Scope .................................................................................................................... 3

1.3 Document Control ................................................................................................. 3

1.4 Permission to Use Certain Documents ................................................................. 3

1.5 Definitions ............................................................................................................. 3

2. INSTRUCTIONS FOR CONTINUED AIRWORTHINESS .................................................... 4

2.1 Introduction ........................................................................................................... 4

2.2 Description of Alteration ........................................................................................ 5

2.3 Control, Operating Information ............................................................................. 8

2.4 Servicing Information ............................................................................................ 8

2.5 Periodic Maintenance Instructions ........................................................................ 8

2.6 Troubleshooting Information ................................................................................. 9

2.7 Removal and Installation Information ................................................................... 13

2.8 Diagrams ............................................................................................................... 18

2.9 Special Inspection Requirements ......................................................................... 18

2.10 Application of Protective Treatments .................................................................... 18

2.11 Data Relative to Structural Fasteners ................................................................... 18

2.12 Special Tools ........................................................................................................ 18

2.13 Additional Instructions ........................................................................................... 19

2.14 Overhaul Period .................................................................................................... 19

2.15 ICA Revision and Distribution ............................................................................... 19

2.16 Assistance............................................................................................................. 19

2.17 Implementation and Record Keeping ................................................................... 19

3. AIRWORTHINESS LIMITATIONS ........................................................................................ 19

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 3 of 19

1. INTRODUCTION

1.1 Purpose

This document is designed for use by the installing agency of the Garmin G500H PFD/MFD System as

Instructions for Continued Airworthiness in response to Title 14 CFR Part 27.1529, Part 27 Appendix A..

This ICA includes information required by the operator to adequately maintain the Garmin G500H

system installed under STC SR02295LA.

1.2 Scope

This document identifies the Instruction for Continued Airworthiness for the modification of the rotorcraft

for installation of the Garmin G500H PFD/MFD System installed under STC SR02295LA.

1.3 Document Control

This document shall be released, archived, and controlled in accordance with the Garmin document

control system. When this document is revised, refer to Section 2.15 for information on how to gain FAA

acceptance or approval and how to notify customers of changes.

1.4 Permission to Use Certain Documents

Permission is granted to any corporation or person applying for approval of a Garmin G500H system to

use and reference appropriate STC documents to accomplish the Instructions for Continued

Airworthiness and show compliance with STC engineering data. This permission does not construe

suitability of the documents. It is the responsibility of the applicant to determine the suitability of the

documents for the ICA.

1.5 Definitions

The following terminology is used within this document:

1) ACO: Aircraft Certification Office

2) ADC: Air Data Computer

3) AEG: Aircraft Evaluation Group

4) AHRS: Attitude Heading Reference System

5) CFR: Code of Federal Regulations

6) FAA: Federal Aviation Administration

7) ICA: Instructions for Continued Airworthiness

8) MFD: Multi-Function Display

9) PFD: Primary Flight Display

10) PMI: Principle Maintenance Inspector

11) STC: Supplemental Type Certificate

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 4 of 19

2. INSTRUCTIONS FOR CONTINUED AIRWORTHINESS

2.1 Introduction

Content, Scope, Purpose and Arrangement: This document identifies the Instructions for

Continued Airworthiness for the modification of the

rotorcraft by installation of the Garmin G500H

PFD/MFD System.

Applicability: Applies to Bell models 407 rotorcraft altered by

installation of the Garmin G500H PFD/MFD

System.

Definition of Abbreviations: See Section 1.5

Precautions: None

Units of measurement: None

Referenced publications:

Garmin 190-01150-06 Rev. 3 “G500H Rotorcraft

STC Installation Manual” or later FAA Approved

Revisions

Garmin 190-01150-44 Rev. 3 “GENERAL

ARRANGEMENT, G500H SYSTEM, BELL 407

ROTORCRAFT” or later FAA Approved Revisions

Additional Maintenance Data: Garmin 190-01150-45 Rev. 3 “INSTALLATION,

G500H SYSTEM, BELL 407 ROTORCRAFT” or

later FAA Approved Revisions

Garmin 005-W0222-00 Rev. 3 “G500H MAIN

WIRE HARNESS ASSEMBLY” or later FAA

Approved Revisions

Garmin 005-W0222-01 Rev. 1 “G500H NAV

1 HARNESS ASSEMBLY” or later FAA

Approved Revisions

Garmin 005-W0222-02 Rev. 1 “G500H GPS

2 HARNESS ASSEMBLY” or later FAA

Approved Revisions

Garmin 005-W0222-03 Rev. 1 “G500H NAV

2 HARNESS ASSEMBLY” or later FAA

Approved Revisions

Garmin 005-W0222-04 Rev. 1 “G500H WX

DATALINK HARNESS ASSEMBLY” or later

FAA Approved Revisions

Garmin 005-W0222-05 Rev. 1 “G500H

IRIDIUM DATALINK HARNESS ASSEMBLY”

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 5 of 19

or later FAA Approved Revisions

Garmin 005-W0222-06 Rev. 1 “G500H

VIDEO HARNESS ASSEMBLY” or later FAA

Approved Revisions

Garmin 005-W0222-07 Rev. 2 “G500H

SERIAL ALTITUDE HARNESS ASSEMBLY”

or later FAA Approved Revisions

Garmin 005-W0222-08 Rev. 1 “G500H

TRAFFIC HARNESS ASSEMBLY” or later

FAA Approved Revisions

Retention: This document, or the information contained within,

will be included in the rotorcraft’s permanent

records.

2.2 Description of Alteration

This STC upgrades existing avionics for the Bell 407 rotorcraft as summarized below.

The Garmin G500H Flight Display System consists of an instrument panel mounted GDU 620 display

and remote mounted LRUs which provide data to the display. The GDU 620 provides controls for the

G500H system and a PFD and MFD in the pilot’s primary field of view. The remote mounted LRUs

include one GRS 77H AHRS, one GMU 44 Magnetometer, one GDC 74H ADC, and one GTP 59 OAT

probe.

Rotorcraft modified under this G500H STC are restricted to VFR only, including rotorcraft that may not

have previously been restricted to VFR. To clarify this operation limitation, a placard with the text,

“APPROVED FOR DAY/NIGHT VFR” is required to be in the pilot’s view.

A placard with the text, “MAX RATE OF CLIMB 2000 FPM” shall be installed adjacent to the primary

flight display.

All installed G500H equipment is connected to a power bus that receives power as soon as the battery

master switch is turned on.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 6 of 19

Separate circuit breakers have been installed in the overhead circuit breaker panel for each for the GDU

620 (PFD), GRS 77H + GMU 44 (AHRS), and GDC 74H (ADC) as circled below:

3333333

333

55 5

555 5

555

55555

235

225

ENCDG

ALT

XPNDR SPKR

ICS

PHONE

ICS

ADF GPS COMM

VHF 2

NAV

VHF 1

COMM

NAV-COMM

AIR

COND

FLOATS CARGO

ELTHOOK HEATER

RECP

AUX

DETECT

FIRE

LDG

LIGHTS

STOP

PEDAL

PWR CONT INSTR CKPT CAUT

SYSTEM

HYD

OAT/V AMPS RESET FIELD

GENERATORINSTR

SEP

PART

ICE

ANTI

START IGNTR FADEC

ENGINE CONTROLS

OIL

ENGINE INSTR

MGT TRQ NG NP NR PRESSTEMP

FUEL

INSTR

OIL

XMSN INSTR

VALVE QTY PRESS TEMP PRESS

LEFT

OFF

RIGHT

OFF

ATT

OFF

TURN

OFF

FLIGHT INSTRBOOST/XFR

POS LT

OFF

DEFOG

OFF

PITOT

OFF

PART

OFF

ANTI

OFF

HEATER

ENG

ANTI

AVIONICS

MASTER

ICE

SEPCOLL LT

RESET

GEN

BATT

DIM

BRT

CAUT LT

PASS

CABIN LT

AIR

COND

HEATERHIGH

LOW

BLO

FWD AFT

AIR COND

BRT

OFF

INSTR

HYD

OFF

SYS

555

PFD AHRS ADC

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 7 of 19

The installed G500H equipment can be accessed as described below:

1. GDU 620: FS38.0, WL 46.0 Access or remove by removing the six screws in the bezel of the

GDU 620.

2. GDC 74H: FS27.7, WL 40.1 Access or remove by lowering instrument console at its hinge

point and removing the top instrument console cowling.

3. GRS 77H: FS57.0, WL22.0 (Secondary location) Access or remove by removing the cushion

from the co-pilots seat and the panel on top of the seat pedestal.

4. GRS 77H: FS174.5, WL59.4 (Primary location) Access or remove by opening the baggage

compartment and removing the access panel located on the ceiling of the baggage

compartment.

5. GMU 44: FS243.0, WL70.1 (Secondary location) Access or remove by removing the bolts

from the access panel on the pilots side of the aircraft at the juncture of the tail boom and

fuselage.

6. GMU 44: FS316.5, WL74.3 (Primary location) Access or remove by removing the bolts from

the access panel on either side of the aircraft at the juncture of the horizontal stabilizer and

tail boom.

2.2.1 Weight and Balance Information

WeightandBalanceBell407 Momentarm(IN) Location

Item PartNumber Weight(LB) Longitudinal Lateral Primary Secondary

1 011‐01264‐50 GDU620(UnitOnly) 6.38

38.0 6.0

GDU620(Installedwithrackandconnector) 7.04

2 011‐00882‐11 GDC74H(UnitOnly) 1.70

27.7 4.0

GDC74H(Installedwithconnector) 1.92

3 011‐00868‐20 GRS77H(UnitOnl y) 2.80



GRS77H(Installedwithrackandconnector) 3.46

4 011‐00870‐10 GMU44(UnitOnly) 0.35 316.5 0.0 

GMU44(Installedwithrackandconnector) 0.50 316.5 0.0



GMU44(UnitOnly) 0.35 243.0  

GMU44(Installedwithrackandconnector) 0.50 243.0  

[1] A rotorcraft weight and balance is required after installation of the G500H system. Refer to STC

installation manual P/N 190-01150-06 for additional information, including overall size and center of

gravity location of all LRUs.

[2] The longitudinal arm is measured in terms of the fuselage station (FS) number.

[3] The lateral arm is measured in terms of the butt line (BL). The centerline of the helicopter is BL0.00.

The moment arms to the left side (looking forward) are negative (-) and the moment arms to the right

side are positive (+).

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 8 of 19

2.3 Control, Operating Information

See the G500H Pilot’s Guide or the G500H STC Installation Manual, listed under the reference

documentation in paragraph 2.1 of this document, for system operation and self-test information.

2.4 Servicing Information

None. In the event of system failure, troubleshoot the G500H system in accordance with Section 2.6.

2.5 Periodic Maintenance Instructions

Maintenance of the components installed by this STC is on condition, except as noted in the following

table.

Item Interval Description/Procedure

GRS 77H AHRS 5 years

The GRS 77 utilizes an Earth magnetic field model which is

updated once every five years as part of the Aviation Database

maintained by the owner/operator. If the magnetic model is not

current, the unit will issue an alert upon startup indicating the

model has expired. The model can be updated by inserting an

aviation database card with an updated IGRF model and

powering on the system. A prompt will direct the user to press

ENT to update the model.

GDC 74H ADC On condition

Per Part 43 Appendix E, paragraph (b)(2), the GDC 74H must be

checked using a test procedure equivalent to Part 43 Appendix E,

paragraph (b)(1) with the following exception:

The tests of sub-paragraphs (iv) (Friction) and (vi) (Barometric

Scale Error) are not applicable because the digital outputs of the

GDC 74H are not susceptible to these types of errors.

GDU 620, GRS 77H,

GDC 74H, GMU 44, GTP

12 Calendar

Months

Conduct a visual inspection (look for signs of wear, deterioration,

or damage to wires, backshells, or connectors) on units and their

wire harnesses to ensure installation integrity:

1. Gain access to LRU (see General Arrangement Drawing

for LRU locations)

2. Inspect each unit for security of attachment.

3. Inspect all knobs and buttons for legibility.

4. Inspect condition of wiring, routing and

attachment/clamping.

5. Inspect integrity of shield terminations.

6. Inspect for signs of corrosion on equipment and their rack

installations.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 9 of 19

Item Interval Description/Procedure

GDU 620, GRS 77H,

GDC 74H, GMU 44, GTP

Every 2000

flight hours or

ten (10)

years,

whichever is

first

Perform an electrical bonding test for each listed LRU:

1. Gain access to the LRU (see General Arrangement

Drawing for LRU location)

2. Disconnect all harness connectors from the LRU

3. Measure the resistance between the LRU and a nearby

exposed portion of aircraft metallic structure

a. For the GDU 620, verify the resistance is less than

or equal to 40 milliohms

b. For the remaining LRUs, verify the resistance is

less than or equal to 20 milliohms

4. Reconnect all disconnected harness connectors and

ensure they are secure

Repeat for each listed LRU.

2.6 Troubleshooting Information

If error indications are displayed on the GDU 620 display unit, consult the Troubleshooting section

contained below:

2.6.1 G500H Troubleshooting

Table 2-1. GDU 620 Troubleshooting Guide

Problem Cause Solution

Unit does not power up –

blank screen.

Improper wiring; circuit breaker

open.

Ensure power is properly wired to the

GDU 620 and the circuit breaker is closed.

Unit intensity turned down.

Ensure that unit is not in manual intensity

control mode with the intensity turned

down.

All expected configuration

pages are not displayed.

An Installer Unlock Card is not

inserted into the GDU 620.

Insert the Installer Unlock Card

P/N 010-00769-60 into the bottom slot of

the GDU 620 and cycle power.

The GDC OAT probe type

shows up as UNKNOWN

The RS-232 connection to the

GDC 74H is not working.

Ensure that the GDC 74H RS-232

connection to the GDU is properly wired,

and ensure that the GDC 74H circuit

breaker is closed.

When loading software, the

LRU software is not being

displayed on the

SOFTWARE UPLOAD page.

The software loader card is

installed in the bottom slot of the

GDU 620.

Insert the loader card in the top slot and

cycle power to the GDU.

The software loader card contains

no information.

Repeat the process for making the

software loader card.

Configuration errors are

displayed on power-up,

before the GDU enters

normal mode.

The configuration module has not

been updated.

Update the configuration module.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 10 of 19

Problem Cause Solution

Vertical GPS deviation is not

displayed on the GDU 620.

For 400W/500W Series units, the

ARINC 429 vertical deviation

labels are not being transmitted.

Enable Labels on the 400W/500W Series

unit ARINC 429 configuration page.

Unable to control the GPS

course when in OBS mode.

The GPS navigator is not correctly

configures as LNAV1/2 or

SYS1/2.

Configure the ARINC 429 inputs/outputs

for LNAV1 (SYS1) or LNAV2 (SYS2)

based upon whether the navigator is

GPS1 or GPS2.

Data is not being received

from an ARINC 429 device.

(valid data is being received

on the 429 input port as

shown on the GDU 620

PORT MONITORING page)

ARINC 429 bus hi and low are

swapped.

Verify wiring.

Wrong device is connected to port

on GDU 620.

Use correct ports (refer to interconnect

details).

Data is not being received

from an ARINC 429 device.

(no data is being received on

the 429 input port as shown

on the GDU 620 PORT

MONITORING page)

On the transmitting LRU, the

ARINC 429 transmitter speed is

not set correctly.

Set the ARINC 429 transmitter speed to

correct speed.

Wiring is not correct.

Check for continuity/shorts and correct as

required.

Attitude and heading on

GDU 620 red ‘X’ / GRS 77H

resets during air data ground

testing.

Attitude and heading errors/resets

are possible if the air data tests

are conducted indoors without a

good GPS signal. With marginal

or no GPS signals present,

sudden changes in airspeed

caused by using a pressure tester

may result in attitude and heading

errors and possibly cause the

GRS 77H to reset. This occurs

because the artificial changes in

airspeed cause disagreement with

the other sensor measurements

internal to the GRS 77H. This

sensor disagreement will not

occur in the normal conditions of

flight.

This is expected behavior and no

troubleshooting is required if this occurs.

To reduce the chances of inducing

attitude and heading errors/resets while

conducting the air data tests, ensure that

the G500H is receiving good GPS signals.

Heading red ‘X’ during air

data ground testing

Invalidation of heading is possible

if the air data tests are conducted

indoors, due to typical magnetic

anomalies, even with a good GPS

signal.

This is expected behavior and no

troubleshooting is required if this occurs.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 11 of 19

2.6.2 G500H Alerts

The G500H will display a number of alerts on the GDU 620 MFD. These are listed in the following table.

Table 2-2. GDU 620 Alert Troubleshooting Guide

Alert Text Cause Solution

AHRS1 GPS – AHRS 1 using

backup GPS source.

AHRS is using the backup GPS

information

Verify GPS1 power and check the wiring

AHRS1 GPS - AHRS is not

receiving any GPS information

AHRS is not receiving any GPS

information.

Verify GPS power and check the wiring

AHRS1 GPS – AHRS 1

operating in exclusively in no-

GPS mode.

AHRS is not receiving any GPS

information.

Ensure that at least one GPS has

acquired a valid position.

If GDU 620 does not have a valid

position, verify wiring between GDU and

GPS receiver, and configuration of GDU

620 and GPS receiver.

If GDU has a valid GPS position, verify

wiring between GDU and GRS. Also

verify time mark wiring.

AHRS1 GPS – AHRS 1 not

receiving backup GPS

information.

AHRS is not receiving GPS

information from GPS2.

Verify GPS2 power and check the wiring

AHRS1 SRVC

AHRS magnetic field model should

be updated. Appears on ground

only.

Update GRS 77H IGRF model (current

model is with aviation database).

AHRS1 TAS

AHRS is not receiving true airspeed

from ADC.

GDC not powered up. Close ADC C/B.

GDC not receiving input from GTP 59

OAT probe. Verify wiring is correct.

ARINC 429 connection from GDC 74H to

GRS 77H is not working. Verify wiring is

correct.

CAL LOST

Registry reports that it has lost

calibration data.

Contact Garmin Technical Support.

CNFG MODULE

The configuration module is

inoperative.

Verify wiring to configuration module

Replace configuration module

DATA LOST

Pilot stored data was lost. Recheck

data and settings.

FAN 1 FAIL

Fan 1 has reported 0 RPM when it

was powered with a PWM duty

cycle higher than or equal to 10%

Inspect the GDU fan for an obstruction.

Contact Garmin Technical Support.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 12 of 19

Alert Text Cause Solution

FAN 2 FAIL

Fan 2 has reported 0 RPM when it

was powered with a PWM duty

cycle higher than or equal to 10%

Inspect the GDU fan for an obstruction.

Contact Garmin Technical Support.

GDL69 CONFIG

The GDL 69 configuration

information stored in the GDL 69

and the GDU 620 configuration

module do not match.

With the GDU 620 in configuration mode,

go to the GDL 69 page in the GDL page

group. Verify that the SET and ACTIVE

configuration settings are the same. If

not, use the SET>ACTV soft key to copy

the configuration settings from the GDU

620 into the GDL 69.

The GDL 69 configuration was

updated using another LRU

(e.g. the GMX 200 or 400W/500W).

Update the GDL 69 configuration using

the GDU 620.

GDU CONFIG

This error appears whenever the

GDU is replaced with a GDU that

was configured for a different

installation.

Cycle power to the GDU. This error

automatically clears on the second power

up with a different configuration module.

Error in the configuration of the

GDU 620.

GDU (1/2) COOLING

Specific GDU has poor cooling, and

power usage is being reduced.

Ensure fans on indicated GDU are

functioning

Ensure fans on indicated GDU are not

obstructed

GDU (1/2) DB ERR

Error in specific database, where

GDU (1/2) DB denotes specific

database.

Verify the correct card is installed, reload

the DB on the card.

GDU (1/2) VOLTAGE

GDU supply voltage is below 12

VDC.

Increase the voltage above 12VDC.

GEO LIMITS

Location is too far north/south for

GRS 77H magnetic compass.

GPS(1/2) FAIL No GPS1 or GPS2 data is available.

Ensure GPS (1/2) is turned on

Verify RS-232 wiring from the GPS to the

GDU 620.

GPS(1/2) PPS Failure

This alert will be set if the PPS

signal has not been received in

more than 5 sec. If the unit is

configured for dual GPSs then the

side will be specified in the error.

Ensure GPS (1/2) is turned on

Verify 1PPS wiring from the GPS to the

GDU 620.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 13 of 19

Alert Text Cause Solution

GPS2 FPL USED

The GPS1 has failed and GPS2 is

configured and operating.

HDG FAULT

AHRS magnetometer fault has

occurred.

GRS 77H not receiving information from

GMU 44. Verify wiring to GMU 44.

HDG LOST

Heading from the GRS77/ GMU 44

is not valid.

Caused by a local magnetic anomaly. No

action required.

<LRU> SERVICE

Specific LRU should be serviced,

where <LRU> denotes specific

LRU.

Return indicated LRU to Garmin for

service.

MANIFEST

GDU has received product data for

an LRU that should have a manifest

entry, but is not in the manifest.

Ensure the manifest is properly

configured.

The LRU software P/N and version

number in the manifest does not

match the values being reported by

that LRU.

Update the LRU software to match the

manifest

Update the manifest to match the LRU

software

NAV1 FAIL No navigation receiver 1 data.

NAV2 FAIL No navigation receiver 2 data.

SIMULATOR The simulator mode is active.

Ensure P6202-36 is not grounded.

SVT DISABLED - Out of

available terrain region.

Location is beyond region covered

by terrain database.

SVT DISABLED - Terrain DB

resolution too low.

A 30 arc-second terrain database is

being used.

Update the Supplemental Data card with

the 9 arc-second terrain database.

SW MISMATCH

GDU software version strings do not

match.

Verify the correct SW is loaded

TRAFFIC FAIL

The traffic information system has

failed.

The GDU 620 is not receiving traffic

information from the traffic sensor. Verify

wiring between GDU 620 and traffic

sensor.

The GDU 620 is receiving information

from the traffic sensor, but the information

is indicating that the traffic sensor has

failed. Troubleshoot traffic system.

TRK LOST

GPS1 TRK lost. HSI defaulted to

GPS2 TRK.

TRK TRAFFIC

Heading Lost. Traffic is now based

on track.

See HDG errors.

2.7 Removal and Installation Information

If any G500H LRUs are removed and reinstalled or a new unit is installed, verify that the LRU unit power-

up self-test sequence is successfully completed and no failure messages are annunciated on the GDU

620 display.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 14 of 19

If any work has been done on the rotorcraft that could affect the system wiring or any interconnected

equipment, verify the G500H system unit power-up self-test sequence is successfully completed and no

failure messages are annunciated on the GDU 620 display.

Whenever removing or installing units, remove power from the LRU by removing aircraft power or

opening the LRU circuit breaker.

2.7.1 GDU™ 620 Unit

2.7.1.1 Removal

1. Remove the six mounting screws from the bezel of the GDU 620.

2. Pull the GDU 620 far enough out from the instrument panel to access the three rear connectors.

3. Disconnect the rear connectors.

4. Remove the GDU 620.

2.7.1.2 Installation

1. Visually inspect the connectors to ensure that there are no bent or damaged pins. Repair any

damage.

2. Connect the rear connectors, ensuring that each slidelock is secured on both sides.

3. Set the GDU 620 into place.

4. Install the six mounting screws into the bezel of the GDU 620.

NOTE

The installation configuration settings are stored in the configuration module and will be

retained when the GDU 620 is replaced with a new unit. User settings, such as map

orientation preferences, are stored internally and will be lost when the GDU 620 is

replaced with a new unit.

Original GDU 620 is Reinstalled

If the original GDU 620 is reinstalled, then no software loading is required. This does not include

units that were returned for repair as their software and configuration files are deleted during the

repair process. No configuration is required.

New, Repaired or Exchange GDU 620 is Installed

If a new, repaired, or exchange GDU 620 unit is installed, then software must be loaded. No

configuration is required.

NOTE

Upon first power-up after installing a new GDU 620, it is normal to see a series of

“LOADING…” messages appear on the screen. These messages indicate that the

GDU 620 is updating its configuration settings from the configuration module.

Refer to Section 5 of the G500H STC Installation Manual for the GDU 620 Software Loading

procedure (5.4.1), followed by the Manifest Configuration (5.5.5) and the Configuration Module

Update (5.5.12).

GDU 620 Configuration Module is Replaced

If the GDU 620 Configuration Module is replaced, the GDU 620 will update the configuration module

from its internally-stored settings when the UPDT CFG soft key is pressed If the GDU 620 is

replaced at the same time as the Configuration Module, then the System Setup will need to be

performed per Section 5.5 of the G500H STC Installation Manual.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 15 of 19

2.7.1.3 Return to Service

After removing and reinstalling the GDU 620 per the instructions above, a simple return-to-service check

should be performed.

1. Power up the GDU 620 and all interfaced systems in normal mode.

2. Verify that there are no red-Xs and that no alerts are present. If red Xs or alerts are present,

troubleshoot using Section 2.6 of this ICA.

2.7.2 GRS 77H Unit

2.7.2.1 Removal

1. Disconnect the GRS 77H connector.

2. Loosen the four Phillips thumbscrews with a screwdriver.

3. Gently lift the GRS 77H from the mounting plate (if the supports for the mounting plate are

removed, the GRS 77H must be recalibrated)

2.7.2.2 Installation

1. Place the GRS 77H on the mounting plate, ensuring the orientation is correct.

2. Fasten the unit to the plate using the Phillips thumbscrews. Recommended torque is 22-25 inch

pounds.

3. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any

damage.

4. Connect the connector to the GRS 77H, ensuring that each slidelock is secured on both sides.

Original GRS 77H is Reinstalled

If the original GRS 77H is reinstalled, then no software loading is required. This does not include

units that were returned for repair as their software and configuration files are deleted during the

repair testing process. Reference Table 2-3 to determine whether recalibration is required.

New, Repaired, or Exchange GRS 77H is Installed

If a new, repaired, or exchange GRS 77H unit is installed then software must be loaded per Section

5.4.2 of the G500H STC Installation Manual. Reference Table 2-3 to determine whether re-

calibration is required.

GRS 77H Configuration Module is Replaced

If the GRS 77H Configuration Module is replaced, the GRS 77H must be re-calibrated. Reference

Table 2-3.

2.7.2.3 Return to Service

After removing and reinstalling the GRS 77H, the following return-to-service checks should be

performed.

1. Power up the G500H system with the GDU 620 in normal mode.

2. Verify that the GDU displays valid heading and attitude within approximately one minute. Note

that heading can remain invalid if the magnetometer is near a large metal structure such as a

hangar wall or if the magnetometer is close to a large ground power cart.

3. Verify that no unexpected alerts are present. If alerts are present, troubleshoot using Section

2.6 of this ICA.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 16 of 19

Table 2-3. GRS 77H Calibration Criteria

Condition

Calibrations Required

GRS 77H

Pitch/Roll

Offset

See Section 5

of the G500H STC

Installation Manual

GRS/GMU

Magnetic

Calibration

See Section 5

of the G500H STC

Installation Manual

Engine Run-up

Vibration

Test

See Section 5

of the G500H

STC Installation

Manual

GRS 77H AHRS was removed and/or

replaced. The mounting tray was NOT

removed and the mounting tray bolts

were NOT loosened.

None Required.

GRS 77H AHRS was removed and/or

replaced. The mounting tray WAS

removed and/or mounting tray bolts

WERE loosened.

GRS 77H AHRS Configuration Module

was replaced.

X X X

2.7.3 GMU 44 Unit

2.7.3.1 Removal

1. Gain access to the GMU 44 magnetometer.

2. Unscrew the three screws that hold the GMU 44 to its mounting rack.

3. Carefully lift the GMU 44 from the rack.

4. Disconnect the wiring harness.

2.7.3.2 Installation

1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any damage.

2. Connect the wiring harness to the GMU 44.

3. Lower the GMU 44 into the rack and secure the plate with the three Phillips screws.

Original GMU 44 is Reinstalled

If the original GMU 44 was reinstalled, then software loading is not required. This does not include

units that were returned for repair as their software and configuration files are deleted during the

repair testing process. Recalibration is required only if the mount for the magnetometer was

changed. If the magnetometer mount was changed, refer to Section 5.6.2 of the G500H STC

Installation Manual for the GRS 77H/GMU 44 Magnetic Calibration.

New, Repaired or Exchange GMU 44 is Installed

If a new, repaired, or exchange GMU 44 unit is installed, then software must be loaded and the GRS

77H/GMU 44 Magnetic Calibration must be performed. Refer to Section 5 of the G500H STC

Installation Manual for instructions on software loading (5.4.3) and Magnetic Calibration (5.6.2).

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 17 of 19

Return to Service

After removing and reinstalling the GMU 44, the following return-to-service checks should be performed.

1. Power up the G500H system with the GDU 620 in normal mode.

2. Verify that the GDU displays valid heading within approximately one minute. Note that heading

can remain invalid if the magnetometer is near a large metal structure such as a hangar wall or if

the magnetometer is close to a large ground power cart.

3. Verify that no unexpected alerts are present. If alerts are present, troubleshoot using Section

2.6 of this ICA.

2.7.4 GDC 74H Unit

2.7.4.1 Removal

1. Disconnect the pitot/static plumbing from the rear of the unit. Disconnect the single connector.

2. Remove the two (2) screws on the mounting plate near the pitot/static ports. Loosen the other two

(2) screws.

3. Carefully remove the unit from its mounting location.

2.7.4.2 Installation

1. Place the unit in the mounting tray.

2. Position the unit and fasten using the four (4) screws.

3. Connect the pitot/static plumbing.

4. Inspect the connector and pins for damage. Repair any damage.

5. Connect the connector to the unit, ensuring that each jackscrew is secured.

Original GDC 74H is Reinstalled

If the original GDC 74H is re-installed, then no software loading is required. This does not include

units that were returned for repair as their software and configuration files are deleted during the

repair testing process.

New, Repaired or Exchange GDC 74H is Installed

If a new, repaired, or exchange GDC 74H unit is installed, then software must be loaded to the unit.

Refer to Section 5.4.4 of the G500H STC Installation Manual for more information.

GDC 74H Configuration Module is Replaced

If the GDC 74H Configuration Module is replaced, the GDC 74H must be configured. Refer to

Section 5.5.8 of the G500H STC Installation Manual

2.7.4.3 Return to Service

After removing and reinstalling the GDC 74H, the following return-to-service checks must be performed.

1. Power up the G500H system with the GDU 620 in normal mode.

2. Verify that the GDU displays valid air data within approximately one minute.

3. Verify that no unexpected alerts are present. If alerts are present, troubleshoot using Section

2.6 of this ICA.

4. Perform a leak check of the pitot-static system and observe the airspeed, altitude, and vertical

speed for proper operation.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 18 of 19

2.8 Diagrams

Rotorcraft specific LRU locations and wire routing diagrams are contained in the Garmin Reference

Publications listed in Section 2.1 of this document. Point to point wiring diagrams are in Appendix D of

the G500H STC Installation Manual. Refer to the G500H Post-Installation Checkout Log retained in the

rotorcraft permanent records for a list of the interfaced equipment and port configurations.

2.9 Special Inspection Requirements

2.9.1

Post-Lightning Strike Inspection

In the event of a suspected or actual lightning strike to the aircraft, the GTP 59

OAT Probe and its associated installation shall be inspected.

The probe and the surrounding installation shall be inspected to ensure that there is no structural

damage around the areas where lightning may have attached. If there is visible sign of damage to the

probe then it must be replaced.

Verify that OAT is displayed on the GDU 620 PFD normally.

2.10 Application of Protective Treatments

None, N/A.

2.11 Data Relative to Structural Fasteners

Refer to the following table for data on the location, type, and torque values for structural fasteners.

Location

(seeGeneralArrangement

Drawing)

FASTENERTYPEANDTORQUE

6‐32Screw

12‐15inch‐pounds

8‐32Screw

12‐15inch‐pounds

10‐32Screw

22‐25inch‐pounds

NUT,5/16",HEX,SKIRT

100±20inch‐pounds

InstrumentPanel,

Instruments

X X 

GDU620 X  

GRS77H XX

GDC74H  X X

GMU44 X X 

GTP59 X

2.12 Special Tools

For electrical bonding testing, a milliohm meter is required.

G500H Flight Display System 190-01150-21 Rev. 2

Instructions for Continued Airworthiness Bell 407 Page 19 of 19

2.13 Additional Instructions

None

2.14 Overhaul Period

The system does not require overhaul at a specific time period. Power on self-test and continuous BIT

will monitor the health of the G500H system. If any LRU indicates an internal failure, the unit may be

removed and replaced. See the troubleshooting section contained in the G500H STC Installation

Manual, listed under reference documentation in paragraph 2.1 of this document.

2.15 ICA Revision and Distribution

To revise this ICA, a letter must be submitted to the ACO along with the revised ICA. The ACO will

obtain AEG acceptance, and approve any revision to the Airworthiness Limitations in Section 3. After

FAA acceptance/approval, Garmin will release the revised ICA for customer use, and provide any

required notification of the revision.

The latest revision of this document will be available through any Garmin dealer or from Garmin

customer assistance. A Garmin Service Bulletin, describing ICA revision, will be sent to dealers if

revision is determined to be significant.

2.16 Assistance

FAA Flight Standards Inspectors or the certificate holder’s PMI have the required resources to respond

to questions regarding this ICA. In addition, the customer may refer questions regarding this equipment

and its installation to the manufacturer, Garmin. Garmin customer assistance may be contacted during

normal business hours via telephone 913-397-8200 or email from the Garmin web site at

www.garmin.com.

2.17 Implementation and Record Keeping

Modification of an rotorcraft by this Supplemental Type Certificate obligates the rotorcraft operator to

include the maintenance information provided by this document in the operator’s rotorcraft maintenance

manual and/or the operator’s rotorcraft scheduled maintenance program.

3. AIRWORTHINESS LIMITATIONS

There are no additional Airworthiness Limitations as defined in 14 CFR § 27, Appendix A. A27.4 that

result from this modification. The Airworthiness Limitations section is FAA approved and specifies

maintenance required under §§43.16 and 91.403 of the Federal Aviation Regulations unless an

alternative program has been FAA approved.

Garmin STC for Bell 206/407 User manual

Garmin STC for Bell 206/407 User manual

Garmin STC for Bell 206/407 User manual

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